<?php
$port = 9050;

// create a streaming socket, of type TCP/IP
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

// set the option to reuse the port
socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1);

// "bind" the socket to the address to "localhost", on port $port
// so this means that all connections on this port are now our resposibility to send/recv data, disconnect, etc..
socket_bind($sock, 0, $port);

// start listen for connections
socket_listen($sock);
// create a list of all the clients that will be connected to us..
// add the listening socket to this list
$clients = array($sock);

while (true) {
// create a copy, so $clients doesn't get modified by socket_select()
$read = $clients;
$write = NULL;
$except = NULL;
// get a list of all the clients that have data to be read from
// if there are no clients with data, go to next iteration
if (socket_select($read, $write, $except, 0) < 1)
continue;

// check if there is a client trying to connect
if (in_array($sock, $read)) {
// accept the client, and add him to the $clients array
$clients[] = $newsock = socket_accept($sock);

// send the client a welcome message
socket_write($newsock, "You're connected! There are ".(count($clients) - 1)." users in chat room\r\n");

socket_getpeername($newsock, $ip);
echo "User connected`: {$ip} at ".date("d/m/Y H:i:s", time())."\n";

// remove the listening socket from the clients-with-data array
$key = array_search($sock, $read);
unset($read[$key]);
}

// loop through all the clients that have data to read from
foreach ($read as $read_sock) {
// read until newline or 1024 bytes
// socket_read while show errors when the client is disconnected, so silence the error messages
$data = @socket_read($read_sock, 1024, PHP_NORMAL_READ);

// check if the client is disconnected
if ($data === false) {
// remove client for $clients array
$key = array_search($read_sock, $clients);
unset($clients[$key]);
echo "User disconnected.\n";
// continue to the next client to read from, if any
continue;
}

// trim off the trailing/beginning white spaces
$data = trim($data);

// check if there is any data after trimming off the spaces
if (!empty($data)) {

// send this to all the clients in the $clients array (except the first one, which is a listening socket)
foreach ($clients as $send_sock) {

// if its the listening sock or the client that we got the message from, go to the next one in the list
if ($send_sock == $sock || $send_sock == $read_sock)
continue;
echo $data."\r\n";
// write the message to the client -- add a newline character to the end of the message
socket_write($send_sock, $data."\r\n");

} // end of broadcast foreach

}

} // end of reading foreach
}
// close the listening socket
socket_close($sock);
?> 